Re: Empty Table
- From: "jaromir nemec" <jaromir@xxxxxxxxxxxx>
- To: <jkstill@xxxxxxxxx>, <andert@xxxxxxxxx>
- Date: Mon, 24 Jan 2005 23:28:36 +0100
Hi,
> add a where clause:
> WHERE rownum < 2;
this is in nearly all cases a very good approach, but there is a small but
dangerous trap.
There is a constellation performing even with rownum < 2 a full scan of the
total table. No, I don't mean the old joke with rownum > 2!
This case (true story) is documented in
http://www.db-nemec.com/Selecting_ROWNUM_1.html
Regards
Jaromir D.B. Nemec
----- Original Message -----
From: "Jared Still" <jkstill@xxxxxxxxx>
To: <andert@xxxxxxxxx>
Cc: <jacintakean@xxxxxxxxx>; <oracle-l@xxxxxxxxxxxxx>
Sent: Monday, January 24, 2005 7:56 PM
Subject: Re: Empty Table
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